bug#24918: 25.1; Fonts can make Emacs grind to a halt

[Clément Pit--Claudel]

Hi,

Could this be bug 21028? (https://debbugs.gnu.org/cgi/bugreport.cgi?bug=21028)

Cheers,
Clément.

On 2016-11-10 10:53, Klaus-Dieter Bauer wrote:
> Hello!
> 
> When using Google's "Noto Mono" font, some buffers grind to a halt, with
> user input being registered with roughly a one-second delay. Trying to
> do more, will make Emacs entirely unresponsive to user-input leaving
> only killing the process through the task manager (Windows 10,
> tasgmgr.exe or 'taskkill /F /IM emacs.exe').
> 
> To avoid interaction with other customizations I tried it with
> https://ftp.gnu.org/gnu/emacs/windows/emacs-25.1-x86_64-w64-mingw32.zip
> starting emacs as 'runemacs -Q' and observed the same behavior.
> 
> The issue is dodgy though. The only case where I could consistently
> reproduce it, was `package-list-packages' (using ELPA only). When saving
> the buffer contents as a text file and opening it, the issue did *not*
> occur. 
> 
> Outside of Emacs I haven't yet observed issues with the Noto fonts. 
> 
> The user-side fix (using another font) is easy, but the font being the blame
> was rather unexpected. 
> 
> regards, Klaus
> 
> 
> 
> In GNU Emacs 25.1.1 (x86_64-w64-mingw32)
>  of 2016-09-17 built on LAPHROAIG
> Windowing system distributor 'Microsoft Corp.', version 10.0.14393
> Configured using:
>  'configure --without-dbus --without-compress-install CFLAGS=-static'
> 
> Configured features:
> XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
> TOOLKIT_SCROLL_BARS
> 
> Important settings:
>   value of $LANG: DEA
>   locale-coding-system: cp1252
> 
> Major mode: Package Menu
> 
> Minor modes in effect:
>   tooltip-mode: t
>   global-eldoc-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>   buffer-read-only: t
>   line-number-mode: t
>   transient-mark-mode: t
> 
> Recent messages:
> Mark set [4 times]
> You can run the command ‘package-list-packages’ with M-x pa-l- RET
> Package refresh done
> Mark set
> Quit
> user-error: Saving settings from "emacs -q" would overwrite existing 
> customizations
> Mark set
> user-error: Saving settings from "emacs -q" would overwrite existing 
> customizations
> Package refresh done
> C-x C-g is undefined
> 
> Load-path shadows:
> None found.
> 
> Features:
> (shadow sort mail-extr emacsbug sendmail crm thingatpt cus-edit
> cus-start cus-load wid-edit warnings mm-archive message dired
> format-spec rfc822 mml mml-sec epg mailabbrev gmm-utils mailheader
> mm-decode mm-bodies mm-encode url-handlers mail-utils network-stream nsm
> starttls url-http tls gnutls mail-parse rfc2231 rfc2047 rfc2045
> ietf-drums url-gw url-cache url-auth url url-proxy url-privacy
> url-expand url-methods url-history url-cookie url-domsuf url-util
> url-parse auth-source cl-seq eieio eieio-core cl-macs gnus-util mm-util
> help-fns mail-prsvr password-cache url-vars mailcap finder-inf package
> epg-config seq byte-opt gv bytecomp byte-compile cl-extra help-mode
> easymenu cconv cl-loaddefs pcase cl-lib time-date mule-util tooltip
> eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
> dos-w32 ls-lisp disp-table w32-win w32-vars term/common-win tool-bar dnd
> fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
> lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
> scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame
> cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai
> tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
> slovak czech european ethiopic indian cyrillic chinese charscript
> case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
> cl-preloaded nadvice loaddefs button faces cus-face macroexp files
> text-properties overlay sha1 md5 base64 format env code-pages mule
> custom widget hashtable-print-readable backquote w32notify w32 multi-tty
> make-network-process emacs)
> 
> Memory information:
> ((conses 16 178349 20495)
>  (symbols 56 24138 0)
>  (miscs 48 554 679)
>  (strings 32 31726 4513)
>  (string-bytes 1 843950)
>  (vectors 16 18272)
>  (vector-slots 8 495355 7739)
>  (floats 8 245 115)
>  (intervals 56 6280 29)
>  (buffers 976 24))
>

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